Abstract:

An apparatus for feeding a foil of a printing machine with tension is
disclosed, in which vacuum pressure is only applied to a part of a shaft
through which a foil passes, and an outer surface in contact with the
foil is rotated. The apparatus comprises a cylindrical shaft body
provided with a plurality of holes on the outer surface; a sun roller
provided based on the center of the shaft body, having a diameter smaller
than an inner diameter of the shaft body; a plurality of pinion rollers
closely adhered to one another between the sun roller and the inner
surface of the shaft body; and a bearing stopper provided to seal both
ends of the shaft body and connected with a pump to supply vacuum
pressure to only a space formed by the shaft body, the sun roller and two
of the pinion rollers.

Claims:

1. An apparatus for feeding a foil of a printing machine with tension, the
apparatus comprising:a cylindrical shaft body provided with a plurality
of holes on the outer surface;a sun roller provided based on the center
of the shaft body, having a diameter smaller than an inner diameter of
the shaft body;a plurality of pinion rollers closely adhered to one
another between the sun roller and the inner surface of the shaft body;
anda bearing stopper provided to seal both ends of the shaft body and
connected with a pump to supply vacuum pressure to only a space formed by
the shaft body, the sun roller and two of the pinion rollers.

2. The apparatus as claimed in claim 1, wherein the pinion rollers are
provided at an angle of 120 and the number of them is three.

3. The apparatus as claimed in claim 1, wherein the shaft body is made of
metal, and the rollers are made of rubber.

4. An apparatus for feeding a processing material of a foil and diecutting
printing machine, the printing machine performing printing or diecutting
as the processing material unwound from a storage reel passes between an
impression roller attached with a die and a lower roller corresponding to
the impression roller, the apparatus comprising a feed roller provided
with a die driven at the same circumferential speed as that of the
impression roller and the lower roller.

5. The apparatus as claimed in claim 4, wherein the feed roller is
provided on the same shaft line as that of the impression roller.

Description:

TECHNICAL FIELD

[0001]The present invention relates to an apparatus for feeding a foil of
a printing machine with tension, and more particularly, to an apparatus
for feeding a foil of a printing machine with tension, in which vacuum
pressure is only applied to a part of a shaft through which a foil
passes, and an outer surface in contact with the foil is rotated.

BACKGROUND ART

[0002]A foil printing machine can be manufactured by several types. An
example of the types include rotary stamping or rotary diecutting, which
prints or diecuts by rolling a foil or diecutting material with a roller.
This type is constructed to print or diecut a printing material such as
paper through a stamping machine or cutting machine while allowing the
printing material to pass through the roller.

[0003]Since a conventional printing machine is well-known, its description
will be omitted. However, since the present invention is intended to very
conveniently and exactly print a foil on a printing material, the foil
printing machine will be described.

[0004]Since the foil printing machine should continue to feed a processing
material, such as a stamping foil, for printing on a paper, the
processing material should be supplied intermittently to save the
processing material. An example of the conventional foil printing machine
is shown in FIG. 1. As shown, a processing material F wound in a storage
reel 210 passes through a shaft 212 and is wound in a winding reel 213 as
feed rollers 240 and 250 connected to a feed motor are rotated. The
processing material F, which has passed through the shaft 211, passes
between an impression roller 230 having a die 231 and a lower roller 220
corresponding to the impression roller 230. Since the feed rollers 240
and 250 are rotated in accordance with the feed motor operated only when
the die 231 fixed to the impression roller 230 is in contact with the
lower roller 220, the processing material F should be rotated
intermittently. This is because that the processing material F is wasted
if the feed motor is rotated continuously. In this way, the processing
material of high cost such as foil can be saved.

DISCLOSURE OF INVENTION

Technical Problem

[0005]The conventional foil printing machine little has a problem in case
of low speed operation. However, if printing is performed at high speed,
the conventional foil printing machine has several problems as follows.
The feed motor fails to be operated intermittently at high speed due to a
weight or inertia of the feed roller. Also, as error occurs, a defect and
damage of the processing material are caused. In other words, although
the processing material is theoretically fed longer than an arc length L,
a problem occurs if printing is performed at high speed.

[0006]Furthermore, as illustrated in FIG. 1, according to the conventional
foil printing machine, the processing material F wound in the storage
reel 210 is wound in the winding reel 213 by passing through the shaft
212 as the feed rollers 240 and 250 connected to the feed motor are
rotated. The processing material F, which has passed through the shaft
211, passes between the impression roller 230 having a die 231 and the
lower roller 220 corresponding to the impression roller 230. Since the
feed rollers 240 and 250 are rotated in accordance with the feed motor
operated only when the die 231 fixed to the impression roller 230 is in
contact with the lower roller 220, the processing material F should be
rotated intermittently in accordance with the length L. This is because
that the processing material F is wasted if the feed motor is rotated
continuously. In this way, the processing material of high cost such as
foil can be saved. According to the conventional art, the processing
material wound in the reel is unwound by rotation of the rollers and the
dies. In this case, although not shown, mechanisms for maintaining
tension applied to the processing material should be provided. Examples
of the mechanisms for adjusting tension of the foil, i.e., the processing
material, include shafts, which generally provide vacuum pressure.
However, since it is difficult for the shafts to adjust tension exactly,
problems occur in that the foil is damaged by tension applied thereto and
the foil is prevented from freely moving.

Technical Solution

[0007]Accordingly, the present invention is directed to an apparatus for
feeding a foil of a printing machine with tension, which substantially
obviates one or more problems due to limitations and disadvantages of the
related art.

[0008]An object of the present invention is to provide an apparatus for
feeding a foil of a printing machine with tension, in which vacuum
pressure is only applied to a part of an arc of a shaft and an outer
surface of the shaft is rotated to easily adjust tension applied to the
foil.

[0009]An apparatus for feeding a foil of a printing machine with tension
according to the present invention comprises a cylindrical shaft body
provided with a plurality of holes on the outer surface; a sun roller
provided based on the center of the shaft body, having a diameter smaller
than an inner diameter of the shaft body; a plurality of pinion rollers
closely adhered to one another between the sun roller and the inner
surface of the shaft body; and a bearing stopper provided to seal both
ends of the shaft body and connected with a pump to supply vacuum
pressure to only a space formed by the shaft body, the sun roller and two
of the pinion rollers.

[0010]The pinion rollers are provided at an angle of 120 and the number of
them is three.

[0011]Furthermore, the shaft body is made of metal, and the rollers are
made of rubber.

[0012]Meanwhile, an apparatus for feeding a processing material of a
printing machine according to the present invention, the printing machine
performing printing or diecutting as the processing material unwound from
a storage reel passes between an impression roller attached with a die
and a lower roller corresponding to the impression roller, comprises a
feed roller provided with a die driven at the same circumferential speed
as that of the impression roller and the lower roller.

[0013]The feed roller is provided on the same shaft line as that of the
impression roller.

Advantageous Effects

[0014]Since an apparatus for feeding a foil of a printing machine with
tension according to the present invention can easily adjust tension
applied to the foil, it is possible to prevent the foil from being
damaged and well adapt to a printing procedure of high speed.

[0016]FIG. 2 is a schematic view illustrating a printing machine according
to the present invention;

[0017]FIG. 3 is a perspective view illustrating a shaft of an apparatus
for feeding a foil of a printing machine with tension according to the
present invention;

[0018]FIG. 4 is a sectional view illustrating the shaft shown in FIG. 3;

[0019]FIG. 5 is a longitudinal sectional view illustrating an apparatus
for feeding a foil of a printing machine with tension according to the
present invention;

[0020]FIG. 6 is a sectional view illustrating a shaft of an apparatus for
feeding a foil of a printing machine with tension according to another
embodiment of the present invention; and

[0021]FIG. 7 is a diagram illustrating an apparatus for feeding a foil of
a printing machine with tension according to another embodiment of the
present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0022]FIG. 2 is a schematic view illustrating a printing machine according
to the present invention. As shown, a foil F wound in a storage reel 10
is unwound as a storage reel 10 is rotated. The unwound foil F moves to a
blower 30 in accordance with guide of a tension adjustment shaft 20. The
foil F, which has passed through the tension adjustment shaft 20, is
blown by compressed air of the blower 30 at a given length. The foil,
which has passed through the blower 30, passes through a suction shaft 40
and then reaches a printing part marked with a dotted line. In the
printing part, a die 111 of an impression roller 110 performs printing
while the impression roller 110 is rotated in a state that it is engaged
with a lower roller 120. Feed rollers 130 and 140 at the rear of the
printing part are rotated by being synchronized with the impression
roller 110. A die 131 of the feed roller 130 has an arc greater than that
of a die 111 of the impression roller 110, and moves the foil F without
performing printing. Accordingly, the foil F moves only when foil
printing is performed.

[0023]The foil F, which has passed through the printing part, reaches a
tension adjustment shaft 70 by passing through a general shaft 60, and
passes through a tension adjustment shaft 90 through a blower 80, thereby
being wound in a winding reel 100.

[0024]The foil F, which is blown by the blowers 30 and 80, senses its
blowing length to control a motor, which rotates the winding reel 100 and
the storage reel 10. In other words, if the foil F blown as printing is
performed reaches B from A, the motor of the storage reel 10 is operated
to unwind the foil F to allow the foil F to be blown to A. If the foil F
blown by the blower 80 reaches D, the winding reel 100 performs winding.

[0025]The impression roller 110 of the printing part and the feed roller
130 may be switched with each other in their position.

[0026]In order to adjust tension of the foil F, which is wound and
unwound, an apparatus for feeding a foil with tension is used.

[0027]The apparatus for feeding a foil with tension, as shown in FIG. 3 to
FIG. 5, includes a cylindrical shaft body 91 provided with a plurality of
holes 91a on the outer surface, a sun roller 92 provided based on the
center of the shaft body 91, having a diameter smaller than an inner
diameter of the shaft body 91, a plurality of pinion rollers 93 closely
adhered to one another between the sun roller 92 and the inner surface of
the shaft body 91, and a bearing stopper 94 provided to seal both ends of
the shaft body 91 and connected with a pump to supply vacuum pressure to
only a space formed by the shaft body 91, the sun roller 92 and two of
the pinion rollers 93.

[0028]Referring to FIG. 3, the air holes 91a are formed radially in the
cylindrical shaft body 91 at constant intervals, and rollers 92 and 93
having the same diameter are provided inside the shaft body 91. The sun
roller 92 is provided at the center, and the pinion rollers 93 are
provided with one side abutting the sun roller 92 and the other side
abutting the inner surface of the shaft body 91. The pinion rollers 93
are provided at intervals of 120.

[0029]Accordingly, referring to FIG. 4, the inner space of the shaft body
91 is divided into three parts by the shaft body 91 and the rollers 92
and 93, wherein vacuum pressure is only given to a specific space S. This
is noted from FIG. 5. A vacuum pump and the space S are connected with
the bearing stopper 94, which supports the shaft body 91 and the rollers
92 and 93, through a vacuum hose 95, so that vacuum pressure is supplied
to only the specific space S. In this case, as vacuum pressure is
supplied to only the specific space S, the foil F is adhered to the outer
surface of the shaft body 91 corresponding to the specific space S.

[0030]Particularly, referring to FIG. 4, if the shaft body 91 is rotated
counterclockwise, the pinion rollers 93 are rotated counterclockwise
together with the shaft body 91. In this case, only the sun roller 92 is
rotated clockwise. As the shaft body 91 is rotated, feeding is performed
by tension and rotation of the foil F adhered to the shaft body 91.

[0031]In other words, the shaft 90 serves to tightly maintain the foil F
in the winding reel as the shaft body 91 is rotated counterclockwise. The
shaft 70 serves to tightly maintain the printing part as it is rotated
clockwise. Also, the shaft 20 serves to adjust tension with the storage
reel 10 as it is rotated clockwise.

[0032]Meanwhile, FIG. 6 is a sectional view illustrating a shaft of an
apparatus for feeding a foil of a printing machine with tension according
to another embodiment of the present invention. In case of a shaft 190 of
FIG. 6, its body 191 and sun roller 192 are identical with those of the
aforementioned embodiment. The shaft 190 is different from the
aforementioned shafts in that four pinion rollers 193 are arranged at
intervals of 90. Accordingly, a part to which the foil is adhered becomes
small.

[0033]FIG. 7 is a diagram illustrating an apparatus for feeding a foil of
a printing machine with tension according to another embodiment of the
present invention. Referring to FIG. 7, a feed roller 150 and an
impression roller 130 are arranged on the same shaft line. As shown, the
feed roller 150 and the impression roller 130 are used in combination. A
die 131 is provided with side dies 131a and 131b at its front and rear
sides. The side dies may be provided only at a side of the die. Also, the
side dies may be provided on other lines not circumferential line.

INDUSTRIAL APPLICABILITY

[0034]The present invention can be used to print a foil in a printing
machine.